Thousands have gathered at vigils in Christchurch, Queenstown and around the world to pay tribute to the victims of Friday's attacks.

A vigil at the Basin Reserve, Wellington.

A vigil at the Basin Reserve, Wellington.

A child lights a candle outside Al Huda Mosque in Dunedin.

People gather in Whangarei for a vigil.

People gather in Whangarei for a vigil.

The Book of Condolence.

Prime Minister Jacinda Ardern signs the Book of Condolence

Representatives of the Muslim community and workers prepare grave sites for victims in Christchurch.

Armed police at Parliament.

Tributes left at Hawera Islamic Centre.

Hawera Islamic centre Trustee Ali Butt.

In Christchurch, hundreds of students gathered at the Deans Avenue memorial.

Students, many in their school uniforms, lit candles, made paper chains and sung songs to remember the dead.

Meanwhile, at the post-Cabinet briefing held today, Prime Minister Jacinda Ardern said she will return to Christchurch on Wednesday, and is planning to meet with family members. She also said details of the proposed gun law changes will be revealed within 10 days of the attack.